[GRASS-user] calculate 99.9th percentile

[Hamish]

andrew haywood wrote:
> I have calculated a band ratio for a aerial photograph and would like
> to trim the results to remove some outliers. In particular I would
> like to remove the highest and lowest 0.1% pixel values. How can I
> calculate the 0.1% and 99.9% percentiles. r.univar only allows
> integer values for percentiles.

see discussion here, 2007-10-21:
  "Subject: Re: [GRASS-user] Need for a custom color map"
  http://article.gmane.org/gmane.comp.gis.grass.user/20744/


You can edit the code to allow floating point values, but I don't know
the solution to problems in that earlier email, especially #2.


Hamish



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